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doc: release note on mempool size in -blocksonly
Adds a release note detailing the new mempool sizing behaviour when running in blocksonly mode, and instruction on how to override the new defaults.
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doc/release-notes-26471.md

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Updated settings
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- Setting `-blocksonly` will now reduce the maximum mempool memory
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to 5MB (users may still use `-maxmempool` to override). Previously,
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the default 300MB would be used, leading to unexpected memory usage
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for users running with `-blocksonly` expecting it to eliminate
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mempool memory usage.
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As unused mempool memory is shared with dbcache, this also reduces
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the dbcache size for users running with `-blocksonly`, potentially
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impacting performance.
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